BEIJING, Sept. 12 -- A masked man believed to be an American member of Al-Qaeda threatened terrorist attacks against Los Angeles and the Australian city of Melbourne in a videotape on today's fourth anniversary of Sept 11.

    The latest tape was aired on ABC's "Good Morning America" on Sunday, the fourth anniversary of the Sept. 11 attacks. The man on the tape, wearing a black turban with most of his face covered, calls the attacks of four years ago "blessed events" before making a threat against the US.

    The threat was made by Adam Gadahn, a US national who converted to Islam and became a radical supporter of Osama bin Laden, ABC said.

    ABC News said it had received the tape in Pakistan. Gadahn threatens attacks on the two cities, saying "Allah willing".

    "Yesterday, London and Madrid. Tomorrow, Los Angeles and Melbourne, God willing," said the warning.

    "At this time, don't count on us demonstrating restraint or compassion," the speaker added.

    "We are Muslims. We love peace, but peace on our terms, peace as laid down by Islam, not the so-called peace of occupiers and dictators."

    In a joint statement, Los Angeles Mayor Antonio Villaraigosa and police Chief William Bratton said authorities knew of no specific, credible threat to the city and that they had discussed the tape with FBI and Department of Homeland Security officials.

    Australian police - who have yet to receive a copy of the video - said Monday they are working to get a copy and will examine it soon. Enditem

    (Agencies)